Buckling load analysis of composite grid stiffened structure skirts

The tangent stiffness matrix of laminate shell element and composite laminate beam element is presented in this paper, and the total stiffness matrix of the beam and shell is given for the analysis of advanced grid stiffened composite shell structure. The linear buckling of the advanced grid stiffened composite shell structure is investigated by the finite element method. The influence of the element size is considered for the buckling critical force and buckling mode of the structure, and different boundary conditions on the structural stability of buckling are taken into count with the actual situation. The conclusions of this paper would provide a useful contribution for practical numerical simulation of the composite grid stiffened structure.